Improvement in boilers for preparation of paper-stock from wood



N UNITED STATES BEIGE.

PATENT MORRIS L. KEEN, OE JERSEY orrY, NEW JERSEY, ASSIGNOR rro SAMUEL A. WALSH, OE NEW YORK OITY.

IMPROVEMENT IN BOILERS FOR PREPRTION OF PAPER-STOCK FROM WOOD.

Specification forming part of Letters Patent No. 117,427, dated July 25, 1871.

To all 'whom it may concern:

Be it known that I, MORRIS L. KEEN, of Jersey City, State of New Jersey, have invented a certain new and Improved Boiler for the Preparation of Paper-Stock from Wood, Straw,Gane, and other materials adapted for that use.

The boiler is made strong an d capable of being worked at any desirable pressure to accomplish the obj ect of thorough cooking or disintegration, and may be termed an upright rotary boiler revolving on its Short axis, end over end.

The following- .is a description of what I consider the best means of carrying out the invention.

The accompanying drawing forms a part ot' this specification, and represents a longitudinal section. Referring thereto, A is the general interior of boiler; B, a bowl-screen or perforated false internal bottom, fitted securely inside of one end of boiler, and forms a draining-screen when the boiler is in a vertical position. C is a ring of pipe, perforated with small holes, and'4 forms a shower-pipe inside the upper end ofboiler, or man-hole end, when the boiler is set in vertical position. Said shower-pipe is secured to inside of boiler by T-outlets, communicating through the bends R to pipes D1 and D2, and passages M1 and M2 through the trunnions K1 and K2. E1 and E2are screw-valves commanding the communication through the pipes D1 and D2.k F is the man-hole bonnet or man-head of boiler. G1 and G2 are stationary inlet and outletpipes connected steam-tight to the stuffing-boxes L1 and L2 in the trunnions. H1 and H2 are pipes connecting between passage-ways M1 and M2 an d the lower end, or that en d of the boiler opposite to the man-head F. They are connected bybends It and R, and communicate with the space S under the false bottom E. I1 and I2 are valves in pipes H1 and H2. J is a large blow-off or pulp-discharge valve connecting with inside of boiler through.

the short pipe T, which forms a passage through both the outside shell of boiler and the Screen B. N is a large gear-wheel xed on one trunnion, to which power is communicated by pinion O to revolve the boiler A. IJ is a pulley on countershaft Q, driven by any convenient power, not represented.

The boiler A is charged with materials for paper-stock, and is treated with steam, water, or

liquid chemicals, gases or air admitted to or forced in the boiler through the trunnion-passages by pipes G1 and G2, leading thereto, and the pipes D1 and D2, and H1 and H2, separately or together. This may be done either while the boiler is revolving or standing still. It will be seen by the arrangement of pipes and valves that the stock can be subjected to treatment through showerpipe, while the boiler is in a vertical position, through the trunnion K2, by opening the valve E2 communicating with the shower-pipe, While the bottom valve I1 is opened to passage through the opposite trunnion K1, and the waste liquids or washing discharged through it. By the arrangement of pipes and valves a great variety ot' manipulations of stock can be practiced, either in the upright or revolving condition of the boiler. The boiler can be discharged under pressure while in a vertical position by opening the large valve J, communicating with inside oi'boiler; or the steam can be blown out through the showerpipe G, valve E1, pipe D1, trunnion K1, and outlet-pipe G1, after which the man-head F may be opened and the contents discharged while the boiler is reversed. The discharge-pipe leading, as shown, from the extreme bottom of the concave or dish-like perforated basin or strainer B,

allows me to discharge the pulp completely7 and rapidly, by the force of the steam,when desired. The double connection D1 D2 H1 H2 allows the current to be reversed momentarily at intervals to clear the strainer. The elongated form of my boiler induces a marked difference in the eli'ect as distinguished from a spherical boiler similarly revolved. Vhen, as usual, theboiler is only partly iilled the contents tiunble, gather together, and tumble again, while in a spherical boiler there is no possible tumbling, but only a rubbing around on the spherical-recessed interior. The annular form and arrangement of' the sprinkler C, extending in a ring around the seat ofthe manhead F, keeps it out of the way ofthe ready access, which is so highly important, through the man-head, and yet gives an effectual distribution of the water equally on all sides ofthe Inanhole and over the whole mass of the pulp.

I claim as my inventionl. The elongated boiler A, capable of being revolved on its short axis, and provided with the double set of connections D1 D2 H1 H2, and the proper controlling` means for admitting and dis- I the boiler from the concave interior surface of charging uids through the trunnions in the manthe strainer B, as specified.

ner speciied. In testimony whereof I have hereunto set my 2. In suchboilersooperated,theannularsprinkname in the presence of tWo subscribing Witler C arranged as shown relative to the mannesses.

head F. MORRIS L. KEEN.

3. In such boiler so operated, the drain-pipe or Witnesses: discharge-pipe l and its controlling,` means7 When C. C. LIVINGS,

the same loads out in line With the long axisof A. HOERMANN. 

